JDK中用到的设计模式

1. java.io 中用到了装饰模式和适配器模式

装饰模式，

In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. It is therefore advisable to wrap a BufferedReader around any Reader whose read() operations may be costly, such as FileReaders and InputStreamReaders.

 

 BufferedReader in = new BufferedReader(new FileReader("foo.in"));

 

适配器模式,

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.

InputStreamReader(InputStream in, String charsetName)
          Create an InputStreamReader that uses the default charset.

 

2. 观察者模式

Observer和Observable

Listener

 

3. 工厂模式 Service Provider

 

4.